Simone Biles called it “easy money.” Laurie Hernandez said “NO WAYY” (Update: Then did it anyway).

Olympic bobsledder Sam McGuffie challenged the gymnasts, plus Aly Raisman, to what he called the back flip box jump challenge via Twitter.

McGuffie has long been known for athleticism. While playing Texas high school football, a YouTube video of his highlights was uploaded in 2007 and garnered more than three million views. The running back became known for hurdling defensive backs.

McGuffie signed and played for Michigan, then transferred to Rice after one season. He wasn’t drafted by the NFL but signed with the Raiders in 2013 and played in two preseason games.

McGuffie bounced around NFL practice squads and in the CFL before turning to bobsled in 2015. He has been part of the U.S. national team for three seasons.

He pushed for Codie Bascue in PyeongChang, finishing ninth in the four-man and 25th in two-man.

Two-man? Check. Four-man? Double check. Francesco Friedrich piloted his German sled to gold in the four-man bobsled, becoming the sixth pilot to win gold in both the two- and four-man bobsled in the same Olympics on the final day of competition in PyeongChang.

After tying with Canada’s Justin Kripps in two-man, Friedrich made no doubt in four-man, sliding to a dominant win. The German sled was clear of second by 0.53 seconds. And in second? Another tie on the bobsled course — just like the tie for gold in two-man. South Korea and Germany shared the silver medal.

South Korea’s medal was historic. Won Yun-Jong delivered for the home nation, bringing the country its first medal in the bobsled. Yun Sung-Bin won the country’s first medal in a sliding event by taking gold in skeleton earlier in the games. Germany’s Nico Walther piloted the sled that tied.

Codie Bascue piloted the top American sled to a ninth-place finish. Nick Cunningham and Justin Olsen improved in Runs 3 and 4 to finish 19th and 20th, respectively.

German pilot Francesco Friedrich can make history. After tying for gold in the two-man bobsled, he could become just the sixth pilot to win gold in both the two- and four-man competition in the same Games — and his first two runs in the four-man put him in position to do exactly that. Friedrich’s German sled is in first place after Day 1 of competition, leading by a massive 0.29 seconds with two runs remaining.

The team that could keep Friedrich from history is a Korean squad hoping to make some of its own. Yunjong Won piloted his Korean sled to second place after Runs 1 and 2, putting his sled in position to win the country’s first medal in bobsled. Yun Sung-Bin won Korea’s first medal in skeleton in front of a raucous home crowd, and the fans are back in full force at the sliding center for the four-man bobsled.

Codie Bascue led the top American sled in ninth place, 0.53 out of medal contention. Nick Cunningham’s sled is in 20th and Justin Olsen’s sled is in 21st for Team USA.